有谁知道当应用权限发生变化时，应用是否可以在后台收到系统通知？我对在用户更改“位置”权限和“后台应用程序刷新”权限时收到通知特别感兴趣。
到目前为止，我已经研究了这个回调方法:
locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus)
但是，应用程序不会在后台收到通知。
我还尝试为这个通知添加一个观察者:
UIApplicationBackgroundRefreshStatusDidChangeNotification
但我也无法让它工作。
这是我的代码:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
NSNotificationCenter.defaultCenter().addObserver(self, selector: "checkBackgroundPermission", name: UIApplicationBackgroundRefreshStatusDidChangeNotification, object: nil)
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.pausesLocationUpdatesAutomatically = false
if(locationManager.respondsToSelector("requestAlwaysAuthorization")) {
locationManager.requestAlwaysAuthorization()
}
if launchOptions?[UIApplicationLaunchOptionsLocationKey] != nil {
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.pausesLocationUpdatesAutomatically = false
let prefs:NSUserDefaults = NSUserDefaults.standardUserDefaults()
let uuidString = prefs.stringForKey("UUID") as String!
let uuid : NSUUID? = NSUUID(UUIDString: uuidString as String)
beaconRegionGeneral = CLBeaconRegion(proximityUUID: NSUUID(UUIDString: uuidString), identifier: "general")
locationManager.startRangingBeaconsInRegion(beaconRegionGeneral)
setIsRanging(true)
}
if(application.respondsToSelector("registerUserNotificationSettings:")) {
application.registerUserNotificationSettings(
UIUserNotificationSettings(
forTypes: UIUserNotificationType.Alert | UIUserNotificationType.Sound,
categories: nil
)
)
}
return true
}
func checkBackgroundPermission() {
sendLocalNotificationWithMessage("checkBackgroundPermission", playSound: false)
println("checkBackgroundPermission")
}
func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
sendLocalNotificationWithMessage("didChangeAuthorizationStatus", playSound: true)
println("didChangeAuthorizationStatus")
}
最佳答案
您可以使用以下委托(delegate)方法(来自 CLLocationManagerDelegate 协议(protocol))来获取通知。
optional func locationManager(_ manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus)
关于ios - 当应用程序的 "location"和 "background app refresh"权限更改时在后台收到通知，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29857711/